This document and docs/configuring-playbook-livekit-jwt-service.md were both
added in 9970603f1 (Add Element Call support), which squashed a branch that
renamed the role along the way (matrix-jwt-service ->
matrix-livekit-jwt-service). The document belonging to the old name survived
the squash, was never linked to from anywhere and was never touched again,
while the other one is the one referenced by the documentation index, the
README and the Matrix RTC and Element Call documents.

Its remaining content is covered elsewhere, and it was the only place telling
people to enable matrix_livekit_jwt_service_enabled by hand.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Signed-off-by: Suguru Hirahara <did🔑z6MkvVZk1A3KBApWJXv2Ju4H14ErDfRGxh8zxdXSZ4vACDg5>